fix: UI/UX consistency overhaul — fix 8 bugs, standardize design system

Bug fixes:
- Backup refresh no longer re-renders entire page (separate refreshing state)
- SSL cert button no longer flickers when no certs available
- Volume mode selector rewritten to use proper scope system (7 scopes)
- Navigation flicker eliminated when returning from env/volumes pages
- Logout button moved to sidebar footer near theme/locale controls
- Subdomain pattern now shows variable hint tooltip ({project}, {stage}, etc.)
- SSL certificate selector moved to Credentials page with auto-save
- Projects page now has search/filter by name, image, or registry

Consistency improvements:
- New Breadcrumb component replaces 5 inline implementations
- New IconArrowLeft, IconChevronDown components replace inline SVGs
- All inline spinners replaced with IconLoader component
- 10 semantic badge classes with dark mode variants in tokens.css
- Global disabled button cursor-not-allowed rule
- Raw inputs in auth page replaced with FormField components
- Missing aria-labels added to icon-only buttons
- Error panels standardized to use design tokens

web/src/routes/events/+page.svelte

@@ -11,6 +11,7 @@
 	import EventLogEntryComponent from '$lib/components/EventLogEntry.svelte';
 	import EventLogFilter from '$lib/components/EventLogFilter.svelte';
 	import EmptyState from '$lib/components/EmptyState.svelte';
+	import { IconLoader } from '$lib/components/icons';
 
 	// ── State ─────────────────────────────────────────────────────
 
@@ -244,10 +245,7 @@
 	<!-- Event list -->
 	{#if loading}
 		<div class="flex items-center justify-center py-16">
-			<svg class="h-5 w-5 animate-spin text-[var(--color-brand-500)]" viewBox="0 0 24 24" fill="none">
-				<circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
-				<path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z"></path>
-			</svg>
+			<IconLoader size={20} class="animate-spin text-[var(--color-brand-500)]" />
 		</div>
 	{:else if filteredEvents.length === 0}
 		<EmptyState
@@ -279,10 +277,7 @@
 					disabled={loadingMore}
 				>
 					{#if loadingMore}
-						<svg class="h-4 w-4 animate-spin" viewBox="0 0 24 24" fill="none">
-							<circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
-							<path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z"></path>
-						</svg>
+						<IconLoader size={16} class="animate-spin" />
 					{/if}
 					{$t('events.loadMore')}
 				</button>